Proposal for detection of non-Markovian decay via current noise

TL;DR

This paper proposes a method to detect non-Markovian decay in an exciton qubit by analyzing shot-noise measurements in a quantum dot system, highlighting the influence of non-Markovian effects on current noise spectra.

Contribution

It introduces a novel approach to identify non-Markovian decay through shot-noise measurements and demonstrates this effect in specific photonic reservoir models.

Findings

Non-Markovian effects induce super-Poissonian noise in the system.

The noise spectrum includes an additional term from non-Markovian dynamics.

Super-radiance can be used to amplify the noise signal.

Abstract

We propose to detect non-Markovian decay of an exciton qubit coupled to multi-mode bosonic reservoir via shot-noise measurements. Non-equilibrium current noise is calculated for a quantum dot embedded inside a \QTR{it}{p-i-n} junction. An additional term from non-Markovian effect is obtained in the derivation of noise spectrum. As examples, two practical photonic reservoirs, photon vacuum with the inclusion of cut-off frequency and surface plasmons, are given to show that the noise may become super-Poissonian due to this non-Markovian effect. Utilizing the property of super-radiance is further suggested to enhance the noise value.